Superplastic forming of SiAlON ceramics

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb04645.x· OSTI ID:7037627

Hwang, S L; Chen, I W ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

Superplastic SiAlON's of the nominal composition Y[sub m/3]Si[sub 12[minus](m+n)]Al[sub m+n]O[sub n]N[sub 16[minus]n] are reported in this study using a transient-phase-forming approach. They encompass the fields of single-phase [alpha][prime]-SiAlON, single-phase [beta][prime]-SiAlON, and their two-phase mixtures. Excellent formability is obtained at 1,550 C for the [beta][prime] and [alpha][prime] + [beta][prime] materials, and at 1,600 C for the [alpha][prime] material. Typically in the nonequilibrium state before deformation, these fine-grained materials undergo dramatic phase and microstructure evolutions during superplastic forming. In particular, the stress-biased [alpha]-Si[sub 3]N[sub 4] [yields] [beta][prime]-SiAlON reaction is found to result in elongated and aligned grains with fiber-strengthening effect and excellent formability.

• OSTI ID: 7037627
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:10; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
DATA
DEFORMATION
EXPERIMENTAL DATA
FABRICATION
FLOW STRESS
INFORMATION
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PLASTICITY
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
STRESSES